Squeezing detection control method for consumable electrode arc welding

摘要

A squeezing detection control method is provided for consumable electrode arc welding in which a cycle of arc generation and short-circuiting is repeated between a consumable electrode and a base metal. First, squeezed droplet is detected as a premonitory sign of arc recurrence at the end of the short-circuiting. This detection is based on a fact that a squeeze detection reference value is attained by a differential value of the voltage or resistance between the consumable electrode and the base metal. Then, a welding current supplied to a short-circuit load is rapidly decreased upon detection of the squeezed droplet. Upon recurrence of the arc, the welding current is increased. This arc recurrence is detected by a fact that the differential value attains an arc recurrence reference value which is greater than the squeeze detection reference value.

主权项

1. A squeezing detection control method in consumable electrode arc welding in which a cycle of arc generation and short-circuiting is repeated between a consumable electrode and a base metal, the method comprising:
detecting a squeezed droplet as a premonitory sign of arc recurrence at an end of the short-circuiting, the detecting being based on a fact that a differential value of a welding voltage or resistance between the consumable electrode and the base metal increases to a first detection reference value, the differential value being defined as a change rate of the welding voltage or resistance; and detecting recurrence of the arc; wherein the arc recurrence is detected by a fact that the differential value of the welding voltage or resistance increases to a second detection reference value that is greater than the first detection reference value, subsequent to detection of the squeezed droplet.